<!DOCTYPE html>
<html lang="zh">

<head>
    <title></title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://cdn.staticfile.net/vue/2.7.8/vue.js"></script>
    <link href="../css/style.css" rel="stylesheet">
</head>

<body>
<div id="app">
    <p>
        今年3月3日发卖的任天堂新一代主机Switch的价格是：{{price}}円，含税价格为：{{priceInTax}}円，折合人民币为：{{priceChinaRMB}}元。
    </p>

    <button type="button" v-on:click="change(1000)"> commit </button>
</div>
<script>
    const vm = new Vue({
        el: '#app',
        data: {
            price: 29980,
            priceInTax: 0,
            priceChinaRMB: 0,
        },
        methods: {
            change: function (val) {
                this.price = val;
            }
        },
        watch: {
            price: function (newPrice, oldPrice) {
                console.log(newPrice, oldPrice);
                this.priceInTax = Math.round(this.price * 1.08)
                this.priceChinaRMB = Math.round(this.price / 16.75)
            }
        }
    });
</script>
</body>
</html>